libgfortran/generated/reshape_c16.c

   1 /* Implementation of the RESHAPE
   2    Copyright 2002 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "config.h"
  32 #include <stdlib.h>
  33 #include <assert.h>
  34 #include "libgfortran.h"
  35
  36 #if defined (HAVE_GFC_COMPLEX_16)
  37
  38 typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
  39
  40 /* The shape parameter is ignored. We can currently deduce the shape from the
  41    return array.  */
  42
  43 extern void reshape_c16 (gfc_array_c16 * const restrict,
  44         gfc_array_c16 * const restrict,
  45         shape_type * const restrict,
  46         gfc_array_c16 * const restrict,
  47         shape_type * const restrict);
  48 export_proto(reshape_c16);
  49
  50 void
  51 reshape_c16 (gfc_array_c16 * const restrict ret,
  52         gfc_array_c16 * const restrict source,
  53         shape_type * const restrict shape,
  54         gfc_array_c16 * const restrict pad,
  55         shape_type * const restrict order)
  56 {
  57   /* r.* indicates the return array.  */
  58   index_type rcount[GFC_MAX_DIMENSIONS];
  59   index_type rextent[GFC_MAX_DIMENSIONS];
  60   index_type rstride[GFC_MAX_DIMENSIONS];
  61   index_type rstride0;
  62   index_type rdim;
  63   index_type rsize;
  64   index_type rs;
  65   index_type rex;
  66   GFC_COMPLEX_16 *rptr;
  67   /* s.* indicates the source array.  */
  68   index_type scount[GFC_MAX_DIMENSIONS];
  69   index_type sextent[GFC_MAX_DIMENSIONS];
  70   index_type sstride[GFC_MAX_DIMENSIONS];
  71   index_type sstride0;
  72   index_type sdim;
  73   index_type ssize;
  74   const GFC_COMPLEX_16 *sptr;
  75   /* p.* indicates the pad array.  */
  76   index_type pcount[GFC_MAX_DIMENSIONS];
  77   index_type pextent[GFC_MAX_DIMENSIONS];
  78   index_type pstride[GFC_MAX_DIMENSIONS];
  79   index_type pdim;
  80   index_type psize;
  81   const GFC_COMPLEX_16 *pptr;
  82
  83   const GFC_COMPLEX_16 *src;
  84   int n;
  85   int dim;
  86
  87   if (source->dim[0].stride == 0)
  88     source->dim[0].stride = 1;
  89   if (shape->dim[0].stride == 0)
  90     shape->dim[0].stride = 1;
  91   if (pad && pad->dim[0].stride == 0)
  92     pad->dim[0].stride = 1;
  93   if (order && order->dim[0].stride == 0)
  94     order->dim[0].stride = 1;
  95
  96   if (ret->data == NULL)
  97     {
  98       rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
  99       rs = 1;
 100       for (n=0; n < rdim; n++)
 101         {
 102           ret->dim[n].lbound = 0;
 103           rex = shape->data[n * shape->dim[0].stride];
 104           ret->dim[n].ubound =  rex - 1;
 105           ret->dim[n].stride = rs;
 106           rs *= rex;
 107         }
 108       ret->offset = 0;
 109       ret->data = internal_malloc_size ( rs * sizeof (GFC_COMPLEX_16));
 110       ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim;
 111     }
 112   else
 113     {
 114       rdim = GFC_DESCRIPTOR_RANK (ret);
 115       if (ret->dim[0].stride == 0)
 116         ret->dim[0].stride = 1;
 117     }
 118
 119   rsize = 1;
 120   for (n = 0; n < rdim; n++)
 121     {
 122       if (order)
 123         dim = order->data[n * order->dim[0].stride] - 1;
 124       else
 125         dim = n;
 126
 127       rcount[n] = 0;
 128       rstride[n] = ret->dim[dim].stride;
 129       rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
 130
 131       if (rextent[n] != shape->data[dim * shape->dim[0].stride])
 132         runtime_error ("shape and target do not conform");
 133
 134       if (rsize == rstride[n])
 135         rsize *= rextent[n];
 136       else
 137         rsize = 0;
 138       if (rextent[n] <= 0)
 139         return;
 140     }
 141
 142   sdim = GFC_DESCRIPTOR_RANK (source);
 143   ssize = 1;
 144   for (n = 0; n < sdim; n++)
 145     {
 146       scount[n] = 0;
 147       sstride[n] = source->dim[n].stride;
 148       sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
 149       if (sextent[n] <= 0)
 150         abort ();
 151
 152       if (ssize == sstride[n])
 153         ssize *= sextent[n];
 154       else
 155         ssize = 0;
 156     }
 157
 158   if (pad)
 159     {
 160       pdim = GFC_DESCRIPTOR_RANK (pad);
 161       psize = 1;
 162       for (n = 0; n < pdim; n++)
 163         {
 164           pcount[n] = 0;
 165           pstride[n] = pad->dim[n].stride;
 166           pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
 167           if (pextent[n] <= 0)
 168             abort ();
 169           if (psize == pstride[n])
 170             psize *= pextent[n];
 171           else
 172             psize = 0;
 173         }
 174       pptr = pad->data;
 175     }
 176   else
 177     {
 178       pdim = 0;
 179       psize = 1;
 180       pptr = NULL;
 181     }
 182
 183   if (rsize != 0 && ssize != 0 && psize != 0)
 184     {
 185       rsize *= sizeof (GFC_COMPLEX_16);
 186       ssize *= sizeof (GFC_COMPLEX_16);
 187       psize *= sizeof (GFC_COMPLEX_16);
 188       reshape_packed ((char *)ret->data, rsize, (char *)source->data,
 189                       ssize, pad ? (char *)pad->data : NULL, psize);
 190       return;
 191     }
 192   rptr = ret->data;
 193   src = sptr = source->data;
 194   rstride0 = rstride[0];
 195   sstride0 = sstride[0];
 196
 197   while (rptr)
 198     {
 199       /* Select between the source and pad arrays.  */
 200       *rptr = *src;
 201       /* Advance to the next element.  */
 202       rptr += rstride0;
 203       src += sstride0;
 204       rcount[0]++;
 205       scount[0]++;
 206       /* Advance to the next destination element.  */
 207       n = 0;
 208       while (rcount[n] == rextent[n])
 209         {
 210           /* When we get to the end of a dimension, reset it and increment
 211              the next dimension.  */
 212           rcount[n] = 0;
 213           /* We could precalculate these products, but this is a less
 214              frequently used path so proabably not worth it.  */
 215           rptr -= rstride[n] * rextent[n];
 216           n++;
 217           if (n == rdim)
 218             {
 219               /* Break out of the loop.  */
 220               rptr = NULL;
 221               break;
 222             }
 223           else
 224             {
 225               rcount[n]++;
 226               rptr += rstride[n];
 227             }
 228         }
 229       /* Advance to the next source element.  */
 230       n = 0;
 231       while (scount[n] == sextent[n])
 232         {
 233           /* When we get to the end of a dimension, reset it and increment
 234              the next dimension.  */
 235           scount[n] = 0;
 236           /* We could precalculate these products, but this is a less
 237              frequently used path so proabably not worth it.  */
 238           src -= sstride[n] * sextent[n];
 239           n++;
 240           if (n == sdim)
 241             {
 242               if (sptr && pad)
 243                 {
 244                   /* Switch to the pad array.  */
 245                   sptr = NULL;
 246                   sdim = pdim;
 247                   for (dim = 0; dim < pdim; dim++)
 248                     {
 249                       scount[dim] = pcount[dim];
 250                       sextent[dim] = pextent[dim];
 251                       sstride[dim] = pstride[dim];
 252                       sstride0 = sstride[0];
 253                     }
 254                 }
 255               /* We now start again from the beginning of the pad array.  */
 256               src = pptr;
 257               break;
 258             }
 259           else
 260             {
 261               scount[n]++;
 262               src += sstride[n];
 263             }
 264         }
 265     }
 266 }
 267
 268 #endif